package org.langqiao.url;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class HttpRequest {
	
	public static void main(String[] args) {
        //发送 GET 请求
        String s=HttpRequest.sendGet("http://www.baidu.com", "");
        System.out.println(s);
		/*String s = null;
		try {
			s = HttpRequest.sendPost("http://cms.demo1.pptv.com/cms/destory", "table=60&id=22");
		} catch (Exception e) {
			e.printStackTrace();
		}
        System.out.println(s);*/
        
        //发送 POST 请求
        /*String sr=HttpRequest.sendPost("http://cms.demo1.pptv.com/cms/online", "table=60&id=22");
        System.out.println(sr);*/
    }
	
    /**
     * 向指定 URL 发送POST方法的请求
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
    
    /**
     * 向指定URL发送GET方法的请求
     * @param url 发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            //urlNameString = "http://cms.demo1.pptv.com/launcher/sync?vid=23534589&type=&ks=8f96f28c59e7f46d601c99a834b29f21&version=3.0&status=3";
//            URL realUrl = new URL(urlNameString);
//            // 打开和URL之间的连接
//            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();// 打开连接 
//            // 设置通用的请求属性
////            connection.setRequestProperty("accept", "*/*");
////            connection.setRequestProperty("connection", "Keep-Alive");
////            connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
//            // 建立实际的连接
//            connection.connect();
//            // 获取所有响应头字段
//            /*Map<String, List<String>> map = connection.getHeaderFields();
//            // 遍历所有的响应头字段
//            for (String key : map.keySet()) {
//                System.out.println(key + "--->" + map.get(key));
//            }*/
//            // 定义 BufferedReader输入流来读取URL的响应
//            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
//            String line;
//            while ((line = in.readLine()) != null) {
//                result += line;
//            }
            URL realUrl = new URL(urlNameString);   
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();// 打开连接 
            connection.connect();// 连接会话
            // 获取输入流
            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));
            String line;
            StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null) {// 循环读取流
                sb.append(line);
            }
            br.close();// 关闭流
            result = sb.toString();
            connection.disconnect();
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
}
